diff --git a/time_util.cpp b/time_util.cpp
index 8eb675c..727d5a0 100644
--- a/time_util.cpp
+++ b/time_util.cpp
@@ -73,7 +73,7 @@ size_t time_util::time_ns() {
     FILETIME ft;
     GetSystemTimeAsFileTime(&ft);
     size_t t = ((size_t)ft.dwHighDateTime << 32) | (size_t)ft.dwLowDateTime;
-    return t;
+    return t * 100;
 #elif HAVE_CLOCK_GETTIME
     struct timespec ts;
     clock_gettime(CLOCK_REALTIME, &ts);
@@ -83,6 +83,21 @@ size_t time_util::time_ns() {
 #endif
 }
 
+int64_t time_util::time_ns64() {
+#if _WIN32
+    FILETIME ft;
+    GetSystemTimeAsFileTime(&ft);
+    int64_t t = ((int64_t)ft.dwHighDateTime << 32) | (int64_t)ft.dwLowDateTime;
+    return t * 100;
+#elif HAVE_CLOCK_GETTIME
+    struct timespec ts;
+    clock_gettime(CLOCK_REALTIME, &ts);
+    return ts.tv_sec * 1000000000LL + ts.tv_nsec;
+#else
+    return (int64_t)time(NULL) * 1000000000LL;
+#endif
+}
+
 size_t time_time_ns() {
     return time_util::time_ns();
 }
diff --git a/time_util.h b/time_util.h
index 541ec30..8f564cc 100644
--- a/time_util.h
+++ b/time_util.h
@@ -4,6 +4,7 @@
 #if _WIN32
 #include <Windows.h>
 #endif
+#include <stdint.h>
 
 #if __cplusplus
 
@@ -20,6 +21,7 @@ namespace time_util {
     long get_timezone();
     time_t timegm(struct tm* tm);
     size_t time_ns();
+    int64_t time_ns64();
     int mssleep(unsigned int ms);
 }